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参数资料
| 型号： | TPS62731DRY |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1 X 1.50 MM, 0.60 MM HEIGHT, PLASTIC, MO-287UFAD, SON-6 |
| 文件页数： | 6/27页 |
| 文件大小： | 4698K |
| 代理商： | TPS62731DRY |
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OUT
ONmin
IN
V
t
=
260 ns
V
IN
OUT
LPFMpeak
ONmin
(V
V
)
I
=
t
L
-
SLVSAC3
– MAY 2011
DETAILED DESCRIPTION
The TPS62730 combines a synchronous buck converter for high efficient voltage conversion and an integrated
ultra low power bypass switch to support low power modes of modern micro controllers and RF IC's. The
synchronous buck converter includes TI's DCS-Control
, an advanced regulation topology, that combines the
advantages of hysteretic and voltage mode control architectures. While a comparator stage provides excellent
load transient response, an additional voltage feedback loop ensures high DC accuracy as well. The
DCS-Control
enables switch frequencies up to 3MHz, excellent transient and AC load regulation as well as
operation with small and cost competitive external components. The TPS6273x devices offer fixed output voltage
options featuring smallest solution size by using only three external components. Furthermore this step down
converter provides excellent low output voltage ripple over the entire load range which makes this part ideal for
RF applications. In the ultra low power bypass mode, the output of the device VOUT is directly connected to the
input VIN via the internal bypass switch. In this mode, the buck converter is shut down and consumes only 30nA
typical input current. Once the device is turned from ultra low power bypass mode into buck converter operation
for a RF transmission, all the internal circuits of the regulator are activated within a start up time tStart of typ.
50
s. During this time the bypass switch is still turned on and maintains the output VOUT connected to the input
VIN. Once the DC/DC converter is settled and ready to operate, the internal bypass switch is turned off and the
system is supplied by the output capacitor and the other decoupling capacitors. The buck converter kicks in once
the capacitors connected to VOUT are discharged to the level of the nominal buck converter output voltage.
Once the output voltage falls below the threshold of the internal error comparator, a switch pulse is initiated, and
the high side switch of the DC/DC converter is turned on. It remains turned on until a minimum on time of tONmin
expires and the output voltage trips the threshold of the error comparator or the inductor current reaches the high
side switch current limit. Once the high side switch turns off, the low side switch rectifier is turned on and the
inductor current ramps down until the high side switch turns on again or the inductor current reaches zero. The
converter operates in the PFM (Pulse Frequency Modulation) mode during light loads, which maintains high
efficiency over a wide load current range. In PFM Mode, the device starts to skip switch pulses and generates
only single pulses with an on time of tONmin. The PFM mode of TPS62730 is optimized for low output ripple
voltage if small external components are used.
The on time tONmin can be estimated to:
(1)
Therefore, the peak inductor current in PFM mode is approximately:
(2)
With
tONmin: High side switch on time [ns]
VIN: Input voltage [V]
VOUT: Output voltage [V]
L : Inductance [
μH]
ILPFMpeak : PFM inductor peak current [mA]
ON/BYP MODE SELECTION
The DC/DC converter is activated when ON/BYP is set high. For proper operation, the ON/BYP pin must be
terminated and may not be left floating. This pin is controlled by the RF transceiver or micro controller for proper
mode selection. Pulling the ON/BYP pin low activates the Ultra Low Power Bypass Mode with typical 30nA
current consumption. In this mode, the internal bypass switch is turned on and the output of the DC/DC converter
is connected to the battery VIN. All other circuits like the entire internal-control circuitry, the High Side and Low
Side MOSFET's of the DC/DC output stage are turned off as well the internal resistor feedback divider is
disconnected. The ON/BYP need to be controlled by a Micro controller for proper mode selection.
14
Copyright
2011, Texas Instruments Incorporated
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